Application of Polarity Discrimination Method in Partial Discharge Detection of Dry-type transformers
The detection of internal discharge of dry-type transformers coils is of great importance.Once the detected dis-charge position locates inside the coil,e.g.,positions of inter-turn,inter-round,inter-section,inter-layer,it will affect the service life of the product and the coil should be scrapped.This paper outlines the application of polarity discrimination method in detecting partial discharge of dry-type transformers,which uses the characteristics of pulse signal propagation to both ends of the coil to determine whether there are discharge points by signal polarity.